package leetcode;


/**
 *
 *@ClassName SameTree.java
 *@author Leno E-mail:cliugeek@us-forever.com
 *@date 2018年3月13日下午8:57:59
 *@Description Given two binary trees, write a function to check if they are the same or not.

Two binary trees are considered the same if they are structurally identical and the nodes have the same value.


Example 1:

Input:     1         1
          / \       / \
         2   3     2   3

        [1,2,3],   [1,2,3]

Output: true
Example 2:

Input:     1         1
          /           \
         2             2

        [1,2],     [1,null,2]

Output: false
Example 3:

Input:     1         1
          / \       / \
         2   1     1   2

        [1,2,1],   [1,1,2]

Output: false

 */
/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
public class SameTree {
    public boolean isSameTree(TreeNode p, TreeNode q) {
        if(p==null && q==null)
            return true;
        if(p==null || q==null)
            return false;
        if(p.val != q.val)
            return false;
        else
            return isSameTree(p.left,q.left) && isSameTree(p.right,q.right);
    }
}
